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. 2014 Apr 18;112(15):151103.
doi: 10.1103/PhysRevLett.112.151103. Epub 2014 Apr 17.

Inferred Cosmic-Ray Spectrum From Fermi Large Area Telescope γ-Ray Observations of Earth's Limb

M Ackermann  1 M Ajello  2 A Albert  3 A Allafort  3 L Baldini  4 G Barbiellini  5 D Bastieri  6 K Bechtol  3 R Bellazzini  4 R D Blandford  3 E D Bloom  3 E Bonamente  7 E Bottacini  3 A Bouvier  8 T J Brandt  9 M Brigida  10 P Bruel  11 R Buehler  1 S Buson  6 G A Caliandro  12 R A Cameron  3 P A Caraveo  13 C Cecchi  7 E Charles  3 R C G Chaves  14 A Chekhtman  15 J Chiang  3 G Chiaro  16 S Ciprini  17 R Claus  3 J Cohen-Tanugi  18 J Conrad  19 S Cutini  17 M Dalton  20 F D'Ammando  21 A de Angelis  22 F de Palma  10 C D Dermer  23 S W Digel  3 L Di Venere  24 E do Couto e Silva  3 P S Drell  3 A Drlica-Wagner  25 C Favuzzi  10 S J Fegan  11 E C Ferrara  9 W B Focke  3 A Franckowiak  3 Y Fukazawa  26 S Funk  3 P Fusco  10 F Gargano  27 D Gasparrini  17 S Germani  7 N Giglietto  10 F Giordano  10 M Giroletti  21 T Glanzman  3 G Godfrey  3 G A Gomez-Vargas  28 I A Grenier  14 J E Grove  23 S Guiriec  9 M Gustafsson  29 D Hadasch  30 Y Hanabata  31 A K Harding  9 M Hayashida  31 K Hayashi  32 J W Hewitt  9 D Horan  11 X Hou  20 R E Hughes  33 Y Inoue  3 M S Jackson  34 T Jogler  3 G Jóhannesson  35 A S Johnson  3 T Kamae  3 T Kawano  26 J Knödlseder  36 M Kuss  4 J Lande  3 S Larsson  37 L Latronico  38 F Longo  5 F Loparco  10 M N Lovellette  23 P Lubrano  7 M Mayer  1 M N Mazziotta  27 J E McEnery  39 J Mehault  20 P F Michelson  3 W Mitthumsiri  40 T Mizuno  41 A A Moiseev  42 C Monte  10 M E Monzani  3 A Morselli  43 I V Moskalenko  3 S Murgia  44 R Nemmen  45 E Nuss  18 T Ohsugi  41 A Okumura  46 M Orienti  21 E Orlando  3 J F Ormes  47 D Paneque  48 J H Panetta  3 J S Perkins  9 M Pesce-Rollins  4 F Piron  18 G Pivato  16 T A Porter  3 S Rainò  10 R Rando  6 M Razzano  4 S Razzaque  49 A Reimer  50 O Reimer  50 S Ritz  8 M Roth  51 M Schaal  52 A Schulz  1 C Sgrò  4 E J Siskind  53 G Spandre  4 P Spinelli  10 A W Strong  54 H Takahashi  26 Y Takeuchi  55 J G Thayer  3 J B Thayer  3 D J Thompson  9 L Tibaldo  3 M Tinivella  4 D F Torres  56 G Tosti  7 E Troja  39 V Tronconi  16 T L Usher  3 J Vandenbroucke  3 V Vasileiou  18 G Vianello  3 V Vitale  57 M Werner  30 B L Winer  33 K S Wood  23 M Wood  3 Z Yang  58 Fermi LAT Collaboration
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Free article

Inferred Cosmic-Ray Spectrum From Fermi Large Area Telescope γ-Ray Observations of Earth's Limb

M Ackermann et al. Phys Rev Lett. .
Free article

Abstract

Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90 GeV-6 TeV (derived from a photon energy range 15 GeV-1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with index 2.68±0.04 and 2.61±0.08 above ∼200 GeV, respectively.

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